<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Evaluator</title>
    <style>
        textarea {
            width:30em;
            height:60em;
        }
    </style>
</head>
<body>
<form action="eval.php" method="post">
    <input type="submit"/><br>
    <textarea id="code" name="code"></textarea>
</form>
</body>
</html>